Elmer fletcher



E. FLETCHER.

SOUND BOX.

APPucATmN min xuLY 12,1918.

Patented Feb. 24, 1920.

UNITED STATES PATENT OFFICE ELMER FLETCHER, OF CHICAGO, ILLINOIS. ASSIGNOR T0 FLETCHER WORKS CHICAGO. ILLINOIS. A CORPORATION OF ILLINOIS. i'

SOUND-BOX.

Original application led November 2` 191i'` Serial No. 199.807.

Specification of Letters Patent.

Patented 11eb.24, 192o.

Divided and this applicatilohflleid tTu'ljf l2,

1918 Serial No. 244.643.

lie it nowu that l. llLulin {"ma'reiii-zli. a citizen ol' the linited States. and a res-ident, ol Chiengo, in the county ot Cook and State ot Illinois. have. invented certain new and useful In'tproveinents in Sound-Boxes, ot' whieh the following is a full, elear` and exact description.

The invention relates to lsound boxes.

r1`he objeet ol the present` invention is to provide. an improved connection between the needle. support and the sound box. This application is a division ol' Serial No. lflfhtlll. tiled Nov, :2. 1917.

The invention consists in the several novel features hereinafter set t'orth and more par-v ticularly defined by elainis at the eonelusion hereof.

ln the drawing-s: Figure l is a side ele ration ot' a sound box provided with the. invention. Fig'. is a transverse section. Fig'. I-i is; a longitudinal set-tion. Fig. 2l is a detailed perspective showing the parts of the improved pivotal eonneetiou separated from one another.

'l`he instrument eoinprises a sound box T provided with uur suitable ehnnilar and a diaphragm .t whieh is held therein in any suitable manner. :is well understood in the art, so that the diaphragm may be vilJvated responsivelv to movements imparted to the needle liv a reeord or vire versa. 'lhe sound box is' formed with a pair of bearing lugs 2.3 provided with transverseli extending' aliued huile-edged projecting' ribs 2V which are adapted to lornl a t'uleruni t'or the needle support, 'l`hese lugs ire spared apart and the bearing' edges ol' tht Aits i are adapted to extend into V-shapeti no'lh s T formed in a plate-like needle support. tti whieh is provided with a luil l? whieh i` runner-ted to the diaphragm by an arm lo". needle-- sot-het Il is lornied on the supportingV plate vlt' and is adapted to reeeive t'luI needle lf. 'l`he ribs t ure alilud with eau'h other and spaced apart to t'orm :i huile-edged pivotal luleruin at the sides ol` the needle ,support res|uetivelv. and one whieh will minimize l'rietionul resistuuye to the pivotal movements of the support.

'l`he support lo is `vieldinelv held in por sillon lrv :l pair olwire i-lips 2l. eueh ol whieh is provided willi an inwardly extending arxn or member Z8 adapted to 'enten-Valid be, removably held in a Socket 29 tor'nid in the outer side ot' one of the lugs 2gzifiic'l' an arm or member 30 adapted to ut'le'rlienthe support 1G in substantial transveseialini ment with the l nife-edged 'bearingatitli an upturned terminal 3l adapted t'o n'ter a soelt'et. in the undersideol the support; l6"and to hold the terminal spaced from they Support. These terminals also serveto vieldingllv hold the lsupport against.l moi'etiient in the direi-tion ot the kuife-edge bearings. Haeh i-lip :24 is formed of spring 'wire s0 that it will vieldinglv hold the fuleriniiielnbers it and 2T in engaged relation. The soeltets- Si are of sullieient length to prevent lateral movement of elip-lnemhersY 28. In

praetiee. the arm 1U is usually fixed to the diaphragm at the factory, so that in event replacement of a diaphragm is necessary, the needle support must be removed with it. 'These springclips permit ready removal and replacement of the diaphragm and its arm. To release the support, it is only necessary to spring the arms 30 downwardlysuh fieientlv to withdraw the terminals hfrom the seats B2 and then swing the clips laterally to elear the support or withdraw the elipnienibers 28 from their sockets.

This eouneetion exeinplilies n sound-box in whieh thery areI knife-edge bearings between theA needle support and the sound box to minimize frietional resist-allee and by reason of their length. as eontrzedistinguishedfrom pointsv` the bearings will be durable and ellieient. .\lso one in wllirh the pressure is applied in substantial alineinent with the knife* edges and in sut-h manner that` tht` pressure will not materially resist` the pivotal movement of the needle support.. B v emphrviiig wire elipsuis distinguished from tiatsprings. the pressure is applied tothe needle support and to the sound box in substantial alinemeut` with the lt'nite-edgje bearingswhich are otI eonsidelable length so thatV wear will be avoided und there will be no substantial re tardation ot the pivotal movement` ot' the needle support b v the spring i-lips.

ln prat-tire. it has been found that this eonneetion results in el'tieient eonduetion of the vibrations to the diaphragm.

r|`he invention is. not to bounderstootl :is restrieted to the details set forth, siuee thes'e may be modified within the .swipe ef the :ippended claims, without; depui-ling from the spirit, and scope of the invention.

Having thus described the ii1\'eiilioii,wli:d I claim as new and desire to seizure by Leinters Patent, is:

1. In wsound box, the combination of n cese, a, diaphragm in the ense, n needle-su pport connected to the diaphragm, snid support and case being provided with transversely extendin r knifeedge ribs zuid grooves between t lem to form ai transversely extending fulorum, :ind spring clips for yieldingly and removably holding the snpgn't and case in engaged relation .nt said al'ings, having integral members; interfitting w1tl1 and engaging the ense and support only at points in the plane of said knife- In a sound box, the combination of n Case, a diaphragm in Suid euse, a, needlesnpport connected to the diaphragm, nlined fnlcrum bearings between L ie support and lhe ease, and a pair of spring wire clips, the ene/e nnd the support being pi'nrided i'esperlireh with feelin-Ls iii wliirh the lei'minnls nl' llie clips :ne i'eniorzdily elf-retained.

:L In n ennnd box.y the cnmbimdinn nl' n ense, n. diaphragm in snid (nee. :i needle npioi't eonneeied le llie diaphragm, :dined 'nife-edgre beni-inw between (he lsupport. :ind the mme, :ind n pnii' (if 4epi'iiig wire clips. lhe cime and the Huppert being provided respeeA tirol)v n'ilih :enkele in the plnne nl the lnil'e edges :ind in nliieli the terminnle nl' [he liph :Lle i'einnviibl yelf-i'etnined.

4. In il sound bex, (he ennibiimiiiin nl' n ense, :i diilphingm in Huid eine, :l needle 4nipperfY uiniiected to the. dinpliingrni.l :dined knife-edge bearings between (he snpperi :ind (-he casi, und n pziii of spring' wire elipsmneh |nm'i'ded with n piiii nl' inv ni'dli' exlrnding` arms, the nee being;- piniided willi one n'ni'dl),v open Seekets te ieeeiie one, :iiin el the clips, the support having wide in ii mi dei'sde, the other armeA nf the elipe lim-in;4 terminale yieldingly held in lmid sente 

